GD_DEAD
if (test_bit(GD_DEAD, &disk->state))
if (test_bit(GD_DEAD, &disk->state))
test_bit(GD_DEAD, &disk->state));
if (test_bit(GD_DEAD, &disk->state))
test_bit(GD_DEAD, &q->disk->state) ||
!test_bit(GD_DEAD, &req->q->disk->state)) {
if (test_and_set_bit(GD_DEAD, &disk->state))
if (!test_bit(GD_DEAD, &disk->state))